Rockies shortstop Troy Tulowitzki said it was possible he could go to the 15-day disabled list after straining his left groin on Wednesday night. Tulowitzki said how he feels Thursday will determine the next step in dealing with an injury that has lingered since the season-opening series in Houston in April. "It's tough," the shortstop said. "The first thing I thought about was we're playing well and we have a chance for a sweep [Thursday against the Astros]. But sitting there thinking about it, there's nothing you can really do. When you're hurt, you're hurt. "There are some other guys around the league that are dealing with the same sort of things. Only for so long you can keep going out there until you need to get it right. My groin has been bothering me. There have been tweaks here and there and I'd get a day [off], but this is worse than just the kind of tweak I'd normally felt."

Troy Tulowitzki left Wednesday night's game against the Astros in the seventh inning with what the team said was a strained left groin. The Rockies shortstop appeared to suffer the injury while running out an infield ground out in the bottom of the sixth inning. Tulowitzki is scheduled to be re-evaluated on Thursday. "We don't know anything more than just that. We just have to wait and see to what extent," manager Jim Tracy said.

Just a day after coming off the disabled list, Matt Kemp aggravated his left hamstring while scoring from first base against the Brewers on Wednesday night. Kemp's stride slowed noticeably as he came around third base. He left the game immediately. "I don't know what happened," the Dodgers center fielder said. "It's just kind of gave out. It's definitely frustrating, having just come back, and now I will be sitting out a while. ... I tried to hide it, but there really was no hiding this." Kemp, who broke a bat over his knee in the dugout before heading to the clubhouse, will undergo an MRI on Thursday to determine the extent of the injury.

Desmond Jennings, who hasn't played since May 11, is one step closer to rejoining the Rays. The outfielder is scheduled to make a rehab start for Class A Port Charlotte on Thursday and then at Louisville for Triple-A Durham on Friday after testing his knee on Wednesday. "I just wanted to see if I could slide without really thinking about it," Jennings said. "It feels good, no problems at all."

Travis Hafner will have surgery on his right knee on Thursday and is expected to miss four to six weeks. Indians trainer Lonnie Soloff said that Hafner would have an arthroscopic procedure to repair fraying and irritation in his right meniscus. Hafner was placed on the 15-day disabled list before Wednesday's game against Kansas City.

The Angels have placed Jered Weaver on the disabled list with a lower-back injury. Weaver said he's hopeful he can return shortly after he's eligible to do so on June 12. It is only the second DL stint of Weaver's career. "It's always disappointing knowing you're not going to be out there pitching two or three times," Weaver said. "I'm a competitor when I get out there, but I'm going to work my butt off in between here to do whatever it takes to get back on that mound."

The Phillies will be without Roy Halladay for six to eight weeks. The right-hander was placed on the disabled list with a right latissimus dorsi strain on Tuesday. He left Sunday's start against the Cardinals with shoulder soreness. "We hate to have him down, but it's nothing that requires anything other than rest," Phillies assistant general manager Scott Proefrock said.

The Phillies have placed Roy Halladay on the disabled list because of a right latissimus dorsi strain. The move was made retroactive to May 28. He left Sunday's start with shoulder pain.

Jonathon Lucroy suffered a broken right hand in an accident in his hotel room on Sunday night. He will be out four to six weeks, becoming Milwaukee's seventh current player on the disabled list. "It's not going too well in that area," Ron Roenicke said. "Obviously, it hurts our team a lot. I feel really bad for him. And he feels really bad about it." Lucroy said he was reaching under the bed in his hotel room for a sock Sunday night when his wife shifted a suitcase that fell and struck his hand. He tried taking some early swings in the batting cage but couldn't grip the bat properly and informed Roenicke of the injury.

Jered Weaver left his start against the Yankees in the first inning Monday night after only 12 pitches and failing to record an out. The Angels announced Weaver suffered a lower-back injury. The right-hander will undergo an MRI and X-rays on Tuesday before a decision is made on whether he will be placed on the disabled list. "I've never felt anything like that before. It felt like somebody stabbed me in the back," Weaver said. "I couldn't really do much about it. It's very disappointing. You get motivated for games like this."